Carrageenan of <Emphasis Type="Italic">Eucheuma isiforme</Emphasis> (Solieriaceae,Rhodophyta) from Nicaragua |
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Authors: | Yolanda Freile-Pelegrín Daniel Robledo |
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Institution: | (1) Department of Marine Resources, Cinvestav, Km 6 Carretera Antigua a Progreso Cordemex, 97310, A.P. 73 Mérida, Yucatán, México |
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Abstract: | The yield and physicochemical properties of native and alkali treated carrageenan from Eucheuma isiforme harvested from the Nicaraguan coast were investigated. The native carrageenan yield was 57.2% of dry weight and decreased
to 43.5% when the alga was alkali treated. Native carrageenan viscosities showed significant differences between native (144.6 ± 3.3 cPs)
and treated carrageenan (113.9 ± 2.6 cPs) (p < 0.01). Alkali treatment reduced carrageenan sulphate content by 19.3% and increased 3,6 AG content by 13%. Alkali-treated
carrageenan formed very weak gels in 1.5% solutions (<50 g cm−2). Chemical analysis and FTIR spectra revealed that Eucheuma isiforme from Nicaragua is a good source of relatively pure iota-carrageenan with sufficient quality to serve as a substitute for
traditional iota-carrageenan sources. |
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Keywords: | Carrageenan Eucheuma isiforme Extraction Gel properties Structure |
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